Information recording apparatus and method

Abstract

A disc-shaped information recording medium includes a first recording layer (L0 layer) having (I) a first trial write area ( 101 P- 1 ) for trial write of first trial write information for calibration of the laser beam along the first track path (TP 1 ) from the inner circumference toward the outer circumference and (II) a first recording area for recording the first recording information along a first track path (TP 1 ), in this order from the inner circumference side. Furthermore, the disc-shaped information recording medium includes a second recording layer (L1 layer) having (I) a second trial write area ( 101 P- 2 ) for trial write of second trial write information for calibration of the laser beam along the second track path (TP 2 ) from the outer circumference toward the inner circumference and (II) a second recording area for recording the second recording information along a second track path (TP 2 ), in this order from the inner circumference side.

1. An information recording apparatus for recording information onto an information recording medium in a disc shape, comprising at least: a first recording layer and a second recording layer, located on a rear of said first recording layer as viewed from an irradiation side of a laser light for recording,
 said information recording apparatus comprising: 
 a first test writing device for test writing a first test-write information for calibration of the laser light by irradiating the laser light by using an area portion of a predetermined size in order in an opposite direction of a track path of the first recording layer, in a first test writing area in the first recording layer; 
 a second test writing device for test writing a second test-write information for calibration of the laser light for recording by irradiating the laser light by using an area portion of a predetermined size in order in an opposite direction of a track path of the second recording layer, in a second test writing area, which faces the first test writing area, in the second recording layer; and 
 a recording device for recording the information into said first recording layer or said second recording layer, 
 the first and second test writing device test writing the test-write information, respectively, such that an area of the first test writing area into which the first test-write information is test-written and an area of the second test writing area into which the second test-write information is test-written are away from each other in a radial direction of said information recording medium as viewed from a normal direction of said information recording medium. 
 
     
     
       2. The information recording apparatus according to  claim 1 , wherein said information recording apparatus further comprises:
 an area detecting device for detecting areas in which the first and second test-write information is already test written; and 
 a test-writing control device for controlling said first and second writing devices to set a start position at each time of writing the first and second test-write information in accordance with the areas detected by said area detecting device. 
 
     
     
       3. An information recording method of recording information onto an information recording medium in a disc shape, comprising at least: a first recording layer and a second recording layer, located on a rear of said first recording layer as viewed from an irradiation side of a laser light for recording,
 said information recording method comprising: 
 a first test writing process of test-writing a first test-write information for calibration of the laser light by irradiating the laser light by using an area portion of a predetermined size in order in an opposite direction of a track path of the first recording layer, in a first test writing area in the first recording layer; 
 a second test writing process of test-writing a second test-write information for calibration of the laser light by irradiating the laser light by using an area portion of a predetermined size in order in an opposite direction of a track path of the second recording layer, in a second test writing area, which faces the first test writing area, in the second recording layer; and 
 a recording process of recording the information into said first recording layer or said second recording layer, 
 the first and second test writing process test writing the first and second test-write information, respectively, such that an area of the first test writing area into which the first test-write information is test-written and an area of the second test writing area into which the second test-write information is test-written are away from each other in a radial direction of said information recording medium as viewed from a normal direction of said information recording medium.